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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711649106fadfc2f4d9e20d6876633ec840bdc8a10c69d8c27f018a1d1b1d2e7' 
  AND token = 'UbmdXJRLxjUHLUrK5DA7y1FVIU61NOmo2K/a5+rC0MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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