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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e007be8610bbcef551caa60c17fc389c8e49f1beb530bc5eedb42c7d8cb00f6' 
  AND token = 'iK0fYP4NRks7ydX+i58NWiYL7d6Sa++WCLs9K3wC3II=' 
  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"
    }
  }
}