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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9ffcaa66d478695c11f989bbf05b34f1e6bff405a0c7ae5e1d8179effdf2d0' 
  AND token = 'q/MxXUZTZfzilC4/Wu6S2WPRjboorXUpYPf2uuk4kJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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