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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9622258a2565800926e5a7669d53ee5dadf16959ad9935dfef326a0a9c59601d' 
  AND token = 'OFAu94ESPhU0/W2Gmz8CqsJxQefdB0LYE8VC8ZZPcjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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