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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc8574fc687880fcc6e0a8d40c76b4eb14dd35514e658a70d0b2133280d02e5' 
  AND token = 'dq65XeOXlr2xfsCvaW/4VK2bn/cUEoPTzmq3PmT/qtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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