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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302161c50bea7b142719bd54013c28eb2d3fa03b9e5d9005c9d9c33a24bf487e' 
  AND token = 'q06dD/LUUZmdR7uLVyBIRwA0hk4l7QL93Cbh8BRaHoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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