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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf28729410f2984e6f6e694ba41c8029be6ba4b2c0c22f85f2538211988f97d' 
  AND token = 'q3lV2uaEbt5jUl1sXLV0bKvzj+5w9AKWVu43e12K2yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}