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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991a03265d5b93ead1f3ba3ca99401a5c00f9ff8ee0a2fefea2c2f4f78204b3d' 
  AND token = 'Wd9G/l85zA75ffYGmVDYWgNpVgak+Od4ImH5CU7z1bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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