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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df563f8121f61dac0684c8cdc85f7feb48019826ccf81b65f7122fda66d0d79' 
  AND token = '7x6jaSVf4eLsnPW9hH67WO7zZ9zfVKcN3S1QcceU2Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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