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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e8f0ece8e2ac4cce5d810538d9177dd19f72a76fb7c65b334343b51f66c486' 
  AND token = 'ovc56MiR+Pr4nJffj80iRFQrmroITod/qbSs67pze5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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