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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfb0929ed9497695bd0d9515dedaa0e7fdb1dfe8d81413ed97ad5aeef4c79a5' 
  AND token = 'h5w14H5LvsctATQldciz8HWw9g9wzJ6b8o+ogDiOQ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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