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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346550a6ebff1af7db667de2e7aa2f9b6521fe38f9d6afc9134e3b83239d241e' 
  AND token = 'LksWtmTx91nQsO+Q5iisc+r5j4fFZhKsqNTo3PpiVvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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