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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b070211602f5d372cd12ce742c3479b998cdb3344f07f31bef7d576bd4b3ba0e' 
  AND token = 'pwzcXgAPiV26MqOVGeBmmkYkii2WTIrbxYpII//b+FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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