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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17077cc8fb0050fd0dfed4429bf916fe19c50f39233b11131b6df0bf8f75e60' 
  AND token = 'UTYRpeFR+b3SfnfBk9/W7SQ8jwb6h+lGkkJMkbymmoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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