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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2e692d9ac0c16e925951ace99bcc19b9e6ded36bef12c0b84f4cd0a937d067' 
  AND token = 'OCxP2WV/7LkPa78MOqApXYOhgLfB6wsN+k9oud2ZVW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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