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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9c0730d9229dd6343544a69e626a465b5890cc2e08ff25197eac7225518418' 
  AND token = 'A6TJC7u69HjZ7KS9AlVx/tCDAtxqP1fx0XjLEgk8SSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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