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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3860932e33bcef4138e546ceb062116e46846adfea42cd79d9ebd719149ad2' 
  AND token = 'jO9jI4V+fx5hQaRxHFWgY2Wy52IlfwUQzEbw2wVnX7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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