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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d0fe1c37c76b42bfc1578495970549d8d344578b4451e930b3478ea183d757' 
  AND token = 'YA9+7Q7gACw95TW98o+o3EtMXrUBuP+oGCuDZ0LLcts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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