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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89daa80e2e9c1d7301665db098ea3ea080790738a895c9176485d9b783fdc9f' 
  AND token = 'ubdLZG+tk4/P7n2iGcbGGyy45fNxwQVIJKZbb4rF4iE=' 
  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"
    }
  }
}