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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe79788a617a917a8b1a4ca1b09c7395ab18ddec67888fd9239f4d3c7233b075' 
  AND token = 'uemqfYngc23HPlQl3N1+eA+9f8DPmOFILrhhs3WdKWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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