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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ed4f8d24c89ef06e9e3b53e2f06e796e771c4422b207a79cbc40adf154f3a4' 
  AND token = '509W7yD/Co9/+0dLNzAu1UQZ6nkB8+4ujxl98HuJWxo=' 
  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"
    }
  }
}