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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a7c08d6d5e35e7c1a24082c25bcd0a0992ab106e57d25cb7f6a1e31c5125ea' 
  AND token = '838tUds9hKzPy5Zgi6FqlK1JASoOdGhAFajfpdTrhZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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