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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20592f6ddb98b9e142235cf8ad2426f59fc8f65444ba4a1e1f23c515234fba2f' 
  AND token = 'Y0XJdBeNQpHiRLGZfgRFz3F0XxiAE5t0+oh9vDGx+GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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