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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28518244d7a588f6288e26c15c32c497e01290d32ef5cc7c54f55e7e0b69d02a' 
  AND token = 'uR6aaPhkkiCiAOsjvD9Y4uYSvKA0fk3e9RMHYyDSRY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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