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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db5ffc4e6e9dea7fa49b18e2018780c1ed189523a15e9aef8469662dd722f62' 
  AND token = 'M9Z8yglja3bvJBvq6Dj4TJ6kbUzCc9tHbNR+Tfp4aoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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