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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8541e9b18b1c379ddfb814ed4736ce570b20e729ddd1129189b4b30e8685f6' 
  AND token = 'UCQ8Z9h0xxQezM/71gKowWCqGlfQUyG3boADRtt9La0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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