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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5868ba929d91a2d8b62c151ec9b7017900d434ceed5dc4526c537b03aa7e1ab' 
  AND token = 'WC4qi+DtX9dy4DTcrRMOWBJADH+0YbBcGLFCxR8OF0A=' 
  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"
    }
  }
}