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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038d3d2c220a163e45266438a8025985926823c3b6b0305013ad2c563a856d24' 
  AND token = 'VIZ+ZMSjMBSY5KvIF5Ji3eOqXgJi/M/daQjZvddveFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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