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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e675f82d918218b6d78a3bfd681c23e19c28b3a9958dfe1a569ab4a338db7d' 
  AND token = 'BHgP7/n3iCcpKemfcSNR64v1Nn8jC6bqWgMAaK2x39Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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