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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57534f877de5b06d2257418cca073ec8d5952dac3777ea88f71cfc4a3737213f' 
  AND token = 'xoa7OmTeyRC8EfeL2As9h3SvILt8bctCQV4Ypylw3H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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