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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74b1a5cc67ec97681eaf52b1ab9ae64851ae806fc6bf65d9dd0b45e5285e283' 
  AND token = 'Mz0app01oKhuBRLiZFldZu8EDrNe/SCf5cBlzTd4j3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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