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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e25087f97954c5ad1f854e18fe5850ea47990c8f93c94906e4a21d697c5aaf' 
  AND token = 'Q4Fycdh3cNOhnV2TNZ19BELTHhtm9jRm1fpa+QhPoLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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