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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e44eba9d2595fb22bb9eac539f446482fb18eaeb2ac8beea28a40f71c8d2481' 
  AND token = 'O1/bUln7YD5VZpSKW3YwDsxNrOhN8pZrHeVZ5l0MyIY=' 
  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"
    }
  }
}