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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f23da5ed254b8051ebcc243d2d590528f56562573192f09e057cfe736e05bc3' 
  AND token = '8b7Pt51NcFEYAG5JX6T7A1VEYy/nXOTjvYGaA0gOhro=' 
  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"
    }
  }
}