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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5588f6c7e4ec46cd6a91bbbdbaef74d94b32d8b8f8320f4c8ced86627d6a99' 
  AND token = 'NJ/ILzxgZn9bZKr775xUpSF5hfmGfmn5itWLFQl1TmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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