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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242f8ed7c0d6a5bf4fce649695b12510bf8ec58d4b347819b7c7e44f0a2989ef' 
  AND token = 'u8QpEpx7Eufu1dMZ/b8EY1IaivTvMVz0NLAwC0MP61Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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