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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df024ffc86cb38a837b389e014e8f8ed0908ab1a44156f144d2e1523f01b2805' 
  AND token = 'LWFIv2wjFWQkwwDj43ZEsl90+krl7OxdUMjTXnfqEu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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