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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8570dc209727fa802bc7f681b9847b97b5ea2ed9494a04f4ee0fb4edc5172f16' 
  AND token = '9cw/YH4dWC84ITpX6o+z4iagFfhOY7W9B+Va3Nr8Dqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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