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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a164a766e3e3c79247928596da3a6274598d74f6cb0fb2593d36f406e99fc591' 
  AND token = '82uXyu6Ra8te5UmsZb7dlUps1no+MbJln7YCGWhbMfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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