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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb9df16989beec756f71f6acb36b9d777ea71ebb4be18692bb4d5dbabe1dfd2' 
  AND token = '8RkSxiVmdYj14AH6JYboGyx5NCJIZkOw+NMvmvU3h1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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