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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51498578ba47ee48b93deff46e23a51604342e9472119c37f0a8dbbf3cc40a1' 
  AND token = 'SHtNK/LeiGk8DtsqfP2W8jcS6jcLOJE1fKMBwrD/3TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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