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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44645ec4181ad03777fa4dfeeca977782bd807153cf7f89e209a5498c3f78651' 
  AND token = 's9p2kyj5ArD2Kp18AWWgV8dMAC586Pmw7lrUL4S0IyU=' 
  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"
    }
  }
}