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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3a88378c191a94b4c8a310ab6c72b128cbb6524a636d3e44dac533222e9eb3' 
  AND token = 'rW1KdNx33cgKDhytpnv8X2uY5a+TBSSY+MtQuy8Q5a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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