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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73095574c0b7aaf172ed1c5ab21ffb5e6c35121b1abde0eb6eb98ee237b828d2' 
  AND token = 'RY8y/KH9DkYubZVP/MkH7LZj239AHeOsFCPZqMuMq/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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