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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79c3203ecf24b52b15ab645ad7426e7df0776ba62dc9e881d3cf938b122418b' 
  AND token = 'qhHxc7vlViJAPbrv3aJaDUdn7YAsl+fBUDM2sPLQE9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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