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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b6f2291daeecd55a73c9ca1fef9e4362d1f2ba1f94cdff7421b939f3f8f830' 
  AND token = 'Zns7VRGRW6zIQLlJGWmUcvRd6h8byvvJkt0UH8ingb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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