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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59edba425ff3f6eeea24cbf86440149d04f49cc8e274b598953fd914597167bb' 
  AND token = 'oIh63gRy5PI/W5Ln1DDfmhWi74zPGTEAFSTNcKymDF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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