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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083059c3d13fb90e5b4b16b24c9aaf314f0b70bd542147c2be071d0371946a66' 
  AND token = 'zq4JDec0kM38WkbkZPdQnW4p6zXm8Sqc8XYcXzg7ezg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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