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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec837f9b04b8df28c9a239684c8f8b3bdb66529d3bd6e6b5805a460209affc4' 
  AND token = 'mUe7s225B3lHro4UgF4zZ6+ycdBh9wy90fE2RqETR0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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