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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92676ca1316bc4aaf672246a013db7cc03542a3e364b0c24932cadc0b5087cc' 
  AND token = '/2pz3j4mvOd8qcJJDKFTd+vUD2qmprNC4fvJ4CSYlAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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