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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a27d06e6a6fbc4bb131f76e3cf00814e11cf37afd55cf3a3dc34306c29b70d4' 
  AND token = 'kTuGEw3OVTIjA9pdSEvGvzy8iS7WeQ0ixdXlN+98AeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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