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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b80eeac47e01e6d4d1dc399a85b8f7989b72425c53ce9b7485962244f1d4a5' 
  AND token = 'Qc70YPKn8x05DQbWTuw2MsAY3BIVRuAra33R+BNNt2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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