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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2ff4050b5dd021774ecc5ee6033e19b4ce6e5d054b0e5d60ebc7696a8070a4' 
  AND token = 'dwl/alJw9THMQwcqH5QizHQY4KW/e19DS7g9rruWlBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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