SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122228f4846c6f13b5fe0867764d0cfc799829365cff1814fc2ba64addfb7a06' 
  AND token = 'GzNRz63ZbfvqBzMWKGeCx33RZZb5H/DN7FZBKm2F48Y=' 
  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"
    }
  }
}