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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab9daff311b51db171048cb0dcb2e85e932684b7b8875e8034edf5b8c90f01a' 
  AND token = '2li1oM9g6RCJAB5Dvy92Lf7rzbco2q0mzrTDZJDO/2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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