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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0196eee5bcb213f1f65a5751bdccc4cf04f77f73071ac5418d3ab8da1c354a' 
  AND token = 'etQuOu+O03eUXKxYsxbvyWvtVs6IvnQA1MSHAarrU+0=' 
  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"
    }
  }
}