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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d08a904973d2b1f0c03625ad1a4c88e57ba6200bfe573b2d1b993fee469629c' 
  AND token = 'E7unM2Cc1P8Zf5b0KowP7MFreFGx5LhrRYvkctzZBp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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