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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b02ce7786691045f96749ade419eaa59d54a49f44ac3a3c9d60827f83c07072' 
  AND token = 'dyDWlJLDGFJngAuzNM+7z+xD5I0stKz1teJPIu/Ujz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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